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# The Satterthwaite Formula for Degrees of Freedom in the Two-Sample t-Test

Sample some statistics with Satterthwaite. Instructors of AP® Statistics read up on the Satterthwaite formula for degrees of freedom in the two-sample t-test. They see where it comes from and learn about the mathematics underpinning the formula.

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##### Instructional Ideas

- Use the resource with an advanced class

##### Classroom Considerations

- Scholars should be familiar with two-sample t-tests and chi-square distributions
- Pupils must have knowledge of integration

##### Pros

- Very detailed derivation
- Organized presentation is easy to follow

##### Cons

- None

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